linux-kernel - Re: [PATCH v2] scsi: ufs: core: Fix RPMB region size detection for UFS 2.2

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Message-ID: <e96f69b108eb13a87838581aef9325dd74c556d0.camel@gmail.com>
Date: Mon, 09 Feb 2026 15:51:50 +0100
From: Bean Huo <huobean@...il.com>
To: Alexey Charkov <alchark@...pper.net>, Alim Akhtar
 <alim.akhtar@...sung.com>,  Avri Altman <avri.altman@....com>, Bart Van
 Assche <bvanassche@....org>, "James E.J. Bottomley"
 <James.Bottomley@...senPartnership.com>, "Martin K. Petersen"
 <martin.petersen@...cle.com>, Bean Huo <beanhuo@...ron.com>, Can Guo
 <can.guo@....qualcomm.com>
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, 
	stable@...r.kernel.org
Subject: Re: [PATCH v2] scsi: ufs: core: Fix RPMB region size detection for
 UFS 2.2

On Thu, 2026-02-05 at 12:30 +0400, Alexey Charkov wrote:
> Older UFS spec devices (2.2 and earlier) do not expose per-region RPMB
> sizes, as only one RPMB region is supported. In such cases, the size of
> the single RPMB region can be deduced from the Logical Block Count and
> Logical Block Size fields in the RPMB Unit Descriptor.
> 
> Add a fallback mechanism to calculate the RPMB region size from these
> fields if the device implements an older spec, so that the RPMB driver
> can work with such devices - otherwise it silently skips the whole RPMB.
> 
>         Section 14.1.4.6 (RPMB Unit Descriptor)
> 
> Link: https://www.jedec.org/system/files/docs/JESD220C-2_2.pdf
> Cc: stable@...r.kernel.org
> Fixes: b06b8c421485 ("scsi: ufs: core: Add OP-TEE based RPMB driver for UFS
> devices")
> Signed-off-by: Alexey Charkov <alchark@...pper.net>

Hi Alexey,

please address Bart's suggestion in the next version, and add my reviewed tag.

Reviewed-by: Bean Huo <beanhuo@...ron.com>


Kind regards,
Bean